
Newark, New Jersey, USA
Jay Scott Greenspan (born September 23, 1959), better known by his professional name of Jason Alexander, is an American actor, writer, comedian, television director and producer, and singer. He is best known for his role as George Costanza on the television series Seinfeld, appearing in the sitcom from 1989 to 1998. He also has had an active career on the stage, appearing in several Broadway musicals including Jerome Robbins' Broadway in 1989, for which he won the Tony Award as Best Actor in a Musical. He appeared in the Los Angeles production of The Producers with Martin Short. He is the Artistic Director of "Reprise! Broadway's Best in Los Angeles," where he has directed several musicals. Alexander is also an avid poker player.

as Self - Guest

as Prof. Rothchild
2005

as Bourbon Verlander (voice)
1989

as Self - Guest
2015

as Mr. Orlando (voice)
2005

as Self - Guest
2014

as Earl
1994

as Dr. Goodman
2003

as Gene Lundy
2017

as George Costanza
1989

as Self
2003

as Self - Host
1975

as Marty Eels
2002
as Self
2025

as Louis B. Mayer
2026

as Noah Brooks (voice)
2025

as Self
2025

as Dr. Mendelbaum
2025

as Ted / Wingman
2025

as Self - Performer
2023

as Jayda's Dad (voice)
2023

2022

as Self
2022

2022

as Self
2022

as Jason Alexander (archival footage)
2022

as Self
2021

as Narrator
2020

as Nicky Steele
2020

as Dr. Sternbach
2020

as Barry Dragonetti
2018

as Jason Alexander
2018

as Self
2017

as Mark Lembeck
2016

as Self
2016

as Self
2016

as Self
2016

as Mr. Bibb / The Nome King (voice)
2016
as Self - Guest
1 ep.

as Prof. Rothchild
1 episodes

as Bourbon Verlander (voice)
1 episodes

as Self - Guest
1 episodes

as Mr. Orlando (voice)
1 episodes

as Self - Guest
1 episodes

as Earl
1 episodes

as Dr. Goodman
1 episodes

as Gene Lundy
5 episodes

as George Costanza
180 episodes

as Self
8 episodes

as Self - Host
1 episodes

as Marty Eels
1 episodes

as Jason Alexander
5 episodes

as Leonard
1 episodes

as Self
1 episodes

as Kurros
1 episodes

as Self
1 episodes

as Jack
1 episodes

as Self
1 episodes

as Rick (voice)
52 episodes

as Self - Guest
1 episodes

as Self
2 episodes

as Self - Panelist
30 episodes

as Krampus (voice)
1 episodes

Director

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Executive Producer

Executive Producer

Executive Producer

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Director